Stop for talking-machines.



T. W. KIRKMAN.

STOP FOR TALKING MACHINES.

APPLICATION FILED JUNE 13. 1913.

1,203,]. 1 9. Patented Oct. 31, 1916.

4 SHEETSSHEET' I.

T. W. KIRKMAN.

STOP FOR TALKING MACHINES. APPLICATION FILED JUNE I3. I9I3.

1 ,23,1 1 9. Patented 0m. 31, 1916.

4 SHEETSSHEET 2.

WWW: amen/bow T. W. KlR-KMAN.

STOP FOR TALKING MACHINES.

APPLICATION FILED JUNE 1a. 1913.

Patented Oct. 31, 1916.

4 $HEETS-SHEET 3 I. EUHIIIIII 5 WW ntm T. w. KIRKMAN.

STOP FOR TALKING MACHINES. 7

APPLICATION FILED JUNE I3. 1913.

Patented Oct. 31, 1916.

4 SHEETS-SHEET 4.

'rnoinas w. KIRKMAN, on'nnwj YORK, N. Y., ASSIGNOR, BY MESNE Assreniunnrs, '10

KIRKMAN ENGINEERING NEW YORK.

mosaic.

Specification of Letters Patent.

ooaronarioiy, or NEW YORK, N. Y., a conrbn'arron or Patented oet. 31, rate.

Application filed June 13, 1913. Serial N 0. 773,403.

To all whom it may concern:

Be it known that I, THOMAS W. KIRKMAN, a citizen of the United States, residing at New York city, in the county of New York A third object is to furnish improved,

means for releasing the brake by the action of the sound-armgand'a fourth object is to enable the stop, when supplied in the form of an attachment, to be accurately gaged in position with reference to the turn-table.

Of the accompanying drawings, Figure 1 represents a plan view of a portion of a disk talking-machine provided with my improved stop. Fig. 2 represents an elevation ofthe stop, with parts in section. Fig. 3 represents a plan view of the stop on a larger scale, with the gage in place. Fig. 4 represents a section on line 44 of Fig. 3, showing the gage. Figs. 5 and 6 represent, respectively, a plan and elevation showing a modification. Fig. 7 represents a planview showing a second modification. Fig. 8 represents an elevation of the latter, partly in section. Fig. 9 represents a section on the line 99 of Fig. 7. Figs. 10, 11 and 12 represent, respectively, a plan, and front and side elevations showing a third modification.

Referring to Figs. ,1 to 4, 2O indicatesthe cabinet, 21 the turn-table, 22 the sound-arm, and 23 the reproducer of a well-known type of gramophone.

24'is the flat base-plate of the stop, 25 and 26 are posts mounted thereon, and 27 is a brake-plate secured to a sleeve 28 which turns on the post 25.

29 is a leather brake block clamped between ears 30 which are struck up from the sheet-metal brake-plate, and 31 1s a sprlng surrounding the lower part of post 25 for urging the brake inwardly against the edge of the turn-table. The sleeve 28 has fixed to its upper end an arm 32 carrying a vertical pin 33 with which the sound-arm 22 may make contact in order to set the brake in the.

offposition when the reproducer is carried outwardly before starting on a selection.

34 is alatch-plate pivoted on a sleeve 35 which turns on'the post 26, and 36-is an arm fixed to the upper end of said sleeve and carrying a vertical pin 37 with which the sound-arm makes contact at the end of a selection in order to trip the latch-plate. The pivotal adjustment of said arm with respect to the latch-plate enables the operator to adjust the tripping point to corre-.

spond withthe length of the record-groove, and a spring-plate or washer 38 interposed between the latch-plate and sleeve creates frictional resistance to their relative turning movement.

39 is a projection turned up on the end of the sheet-metal latch-plate 34 for engaging a shoulder 40 formed on the brake-plate 27, in order that said latch-plate may restrain the brake in its off position. Said shoulder is formed on one sideuof a slot 41, and on the opposite side, near one endof the slot, is formed a cam surface'42, which carries the projection 39 into the path of shoulder 40 when the brake-plate is turned into its off position somewhat beyond the position which it assumes when restrained by the latch-plate.

43 is an abutment or rest for the latch ing projection 39, formed onthe inner'side of slot 41 adjacent to the shoulder 40, and acting as a stop for the latch-plate when the contact arm 36 is being adjusted with the brake in the stopping position. The position of this abutment with reference to the free end or corner of shoulder40' has an important influence on the proper timingof 1 the trip action, for I have discovered that although theoretically the two should be on thev same radius or line of motion, yet in practice, owing to lostmotion of parts, rounding of the corner, of said shouldergor'" other causes, the tripping action tends; to

occur too soon when they are..:so'related.", I

therefore slightly offset the abutment 43 from the corner of-shoulder 40 as ,represented in Fig. .3 (the amount of ofi'set being.

exaggerated to make it clear) by locating it, in the present instance on a shorter radius A than. the radius B of said shoulder.

lel'represents a temporary wire gage. bent with loops 45 to serve as handles and legs elG to enter holes in the base-plate 24-, whereby thestop may be properly located with reference to the edge of the turn-table 21 when it is being applied to the talkingmachine, the legs of said gage being adapted to abut against the turn-table and one of them beinglocated in the path of the fbrake 29 so that the latter must be retracted stop is adjusted and when. applying the stop. After the holes for the attaching-screws of the base-plate have been made in the cabinet, the gage is removed and the base-plate is screwed in. place.

After being attached to the cabinet, the operated as follows: The reproducer-stylus islocated in the last record groove, which is usually one of several'bl'ank grooves following the end of the selection. The brake plate 2? being in the stopping position as shown in Fig. 1., the contact arm 36 is then turned relatively to the latch-plate 3% until its pin 37 reaches the sound-arm 22, the projection 39 on said latch-plate meanwhile resting against the abutment 43. lhe angle between the contact arm and the latclrplate will then, owing to the olisetting of said abutment from the corner or" shoulder 4L0, be greater than if said corner and abutment were on the same ra dius, or in other words, such oii'setting is equivalent to delaying the point at which the tripping action occurs (by the escape of shoulder 40 past the projection 39) and its amount is made suiiicient to compensate for the tendency to premature tripping due to the causes above mentioned. The brakelate 27 is now retracted to release the turn table, either directly by hand. or indirectly through contact of: the sound-arm 22 with pin 33, causing said brake-plate to be turned on its pivot when the reproducer is moved out beyond its position for the beginning of the selection. Slot 4]. is made long enough to allow this retraction to be continued beyond the engaging point of members 39, 40., so that the cam surface l2 may carry the projection 39 into the path of shoulder 40, whereupon the brake-plate is allowed to return until said members are engaged. The stylus is then placed in the record groove, and at or just utter the end of the selection the latch-plate 341 will be tripped and the brake released through con tact of the sound-arm with post The modification shown in Figs. 5 and (i differs from the foregoing by a transposi tion of the brake-plate and latch-plate, and omission of the feature of brake release through the action of the sound-arm. linger-lipll for direct manual actuation oi? the brake-plate 27 being substituted on the latter in place of the contact arm. Similar parts in these and succeeding views of thedrawing designated by the same numerals as in Figs. 1 to l.

lligs. '7 to 9 represent a modification in which the brake works outwardly against t to inner side of a flange 48 depending from the edge of the turn-table, and the stop is mainly lo hated underneath the latter, its projecting brake-release arm 32 and adj ustabio trip-arm 36 being engaged at the two extremes of movement of the sound-arm by apin clamped to and projectin downwardly from said sound-arm. A straightpull spring 31 is shown in place of the circular-pull spring of the preceding views.

in Figs. 1.0 to 12 l have shown a third modification wherein the movements of the brake-plate": id latchplate are in planes at right-angles to each other, the latch-plate 3% being mounted to turn on a horizontal pivot-post 26 and having an upright adjustable trip-arm 36, while the brake-plate has an upturned portion 50 formed with the brake-release coacting with the latch-plate.

Various other modifications could be made Without departing from my invention.

1. A talkingmachine stop comprising a brake, a latch for holding said brake in its off position a trip member controlling said latch and adjustable with reference thereto to time the occurrence of the tripping action, and abutment forming a stop for the latch during the setting of the tripmember while the brake is in its stopping position, said abutment being positioned to eo iioensate for the tendency to premature tr ppm 2. A. talking-machine stop comprising a bralze-plate having a shoulder, a latch-plate provided with an adjustable trip-member and also having a member for engaging said shoulder to hold the brake-plate in its oil position, and an abutment on said brakeplate, oiiset from. the line of motion of the shoulder, and forming a stop for the latchplate during the adjustment of the tripmembcr while the brake-plate is in its stopping position.

A talkingmachine stop comprising a pivoted, spring projected l'n'alre-member having a latclvengaging shoulder and an oll'set latch-abutmeut adjacent thereto, a pivoted l:1l)(Jl1il)Qll]l)Ll having a projection for engaging said shoulder whcnthe brake is in the oil position and for engaging said abutment when the brake is in the stopping position, and an adjustable trip-member :"rictionally connected with. said latch meni- Jer.

i. Ii. talliing-machine stop comprising brake and latch plates pivoted turn on lip 47 and the members torill 1 "ban the shoulder to engage said projection jection, and said brake-plate having a shoul der to engage said projection when the brake is off, and an abutment on a shorter radius when the brake is on, and a trip-arm pivotally and frictionally connected with said brake-plate.

A talking-machine comprising a braking element and a latching elementhaving complemental engaging members whereby the braking element is restrained in its ofi position, a brake-setting spring attached to said braking element, means on the braking element for positively alining said engaging members by the retracting movement of the braking element, and a trip-member connected with the latching element and adapted, when engaged at the end of the selection, to move said latching element so as to release the braking element and permit the latters spring to set the brake.

6. A talking-machine stop comprising a pivoted latch-plate having aprojection and also having a tripmember, and a pivoted brake-plate having a shoulder adapted to engag'esaid projection, and a cam surface adaptedto engage the projection and aline it with the shoulder when the brake-plate is retracted beyond the engaging position.

7. A talking-machine stop comprising a brake, and means for restraining said brake in the off position said means including a projection,- and a member formed with a slot, on one sideof which is a shoulder to engage the projection, and on the other side a cam to aline sa'id shoulder and said projection, and a trip-member for disengaging the two. i

8. The combination with a turn-table and a traveling element, of a stop comprising a pivoted brake-plate, an arm directly at tached thereto and located in the path of outward movement of a part connected with said traveling element, a spring attached to said brake-plate for setting the latter in its stopping position, a latch for restraining said brake-plate in its off position, and

contact-arm connected with said latch for tripping said latchby the inward movement of the traveling element.

9. In combination with a turntable, a stop attachment comprising a base-plate, braking, latching and tripping elements mounted thereon, and a gage abutting against the periphery of the turntable and detachably connected with said base-plate for initially positioning the latter and the braking element with respect to the turntable.

10. A stop attachment for talking-machines comprising a base-plate having a brake, a latch'and a latch-tripping member,

and a'wire gage formed with legs adapted to be positioned in holes in the base-plate, one of said legs being located in front of the brake when the latter isretracted.

In testimony whereof I have hereunto set my hand in the presence of two subscribingwitnesses, this 12th day of June, 1913.

THOMAS W. KIRKMAN. Witnesses EDWARD E. B ACK,

Gr. BLAKE. 

